Adjustable eccentric.



Nn. 702,223. Patented sept.v 2, |902. H. GBAFF.

ADJUSTABLE ECCENTRIC.

(No Model.)

.j @ai j UNITED STATES PATENTOFFICE HENRY GRAFF, OF PHILADELPHIA, PENNSYLVANIA.

ADJUSTABLE ECCENTRIC.

SPECIFICATION forming part of Letters Patent No. 708,223, dated September 2, 1902.

Application filed October 3| 1901. Serial No. 77,401. (No model.)

T0 all whom it may concern:

Beit known that I, HENRY GRAFF, a citizen of the United States, residing at Philadelphia, county of Philadelphia, State of Pennsylvania, have invented a certain new and useful Improvement in Adjustable Eccentrics, of which the following is a specification.

My invention relates to new and useful improvements in adjustable cranks, and has for its object to provide an adjustment which can be placed in any line of shafting and which attachment carries a wrist-pin which can be adjusted so as to give more or less throw to the pitman to which it is connected.

With these ends in view this invention con# sists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claim.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, the construction and operation willnow be described in detail, referring to the accompanying drawings, forming a part of this specification, in which- Figure l represents an end elevation of my invention; Fig. 2, a section on the line 2 2 of Fig. l, and Fig. 3 a section on the line 3 '3 of Fig. 2.

In carrying out my invention as here embodied, A is a power-shaft, which shaft is separated for the purpose of attaching my invention thereto.

B represents two guide-blocks, one secured to each end of the power-shaft'Aby any suitable means, (here shown` as set-screws C.) These guide-blocks B have'vertical guideways B formed through them.

C represents upright slides,and these slides are adapted to rest and be guided within the guideways B and are connected together by the wrist-pin D, which is adapted to be encircled by the end of the pitman E.

F represents slots formed through the slides C', and Grepresents bolts which pass through the guide-blocks B. upon each side of the guideways B' and through the slot F of the slide C. Y Thus the slides C will have a vertical movement within the guideways B and will be limited only by the length of the slot F, and it will be seen that the wrist-pin B can be placed in alinement with the powershaft A or any distance out of alinement up to a certain limit.

Forthe purpose of adjusting the position of the wrist-pin and holding it in such a position after adjustment I provide the adjusting-screws H, which are four in number, one of said screws being threaded through the top of each of the slides C into the slot F and the other two screws being threaded through the bottom of the slides C' into the slot F. Thus two Aof the screws will bear against the tops of thebolts G and two against the bottom, and" by unscrewing one set of screws and screwing up' the other set upon the opposite side of the bolts the wrist-pin can be set at whatever point desired, and the two sets of screws bearing against the bolts upon opposite sides will hold the wrist-pin in whatever position set, and as the whole attachment revolves with the power-shaft A it will. transmit eccentric motion to the pitman E.

The advantage of my invention is that by the use of this. exceedingly simple and yet durable device j any amount of throw can be given to a pitman without changing from one crankto another, and this is of great advantage in machinery where a variable throw is desired, as it onlyrequires a few minutes to changeor adjust the amount of throw vtransmitted to the pitman'.

Of course Idonot wish to be limited to the exact construction here shown, as slight modiieations could be made without departing from the spirit of my invention.

Havingthus yfully described my invention, what I claim as new and useful is- In'an apparatus of the character described,

:two guide-blocks securedupon the endof a power-shaft, guideways formed in said guideblocks, slides adapted to slide Within said guideways, a wrist-pin connected to each of said slides and extending between the same, slots formed through the slides, bolts secured in the guide-blocks upon each side of the slides and extending through the slot within said slide, and screws threaded through each end of the slides `and adapted to bear against the bolts upon opposite sides, substantially as described and for the purpose specified.

IOO

In testimony whereof I have hereunto afixed my signature in the presence of two subscribing witnesses.

HENRY GRAFF.

Witnesses:

CHARLES GRAFF, J r., JOHN C. MARTIN. 

